A lightweight, select-fire assault rifle firing the small .223 Remington (5.56mm) round. The "Black Rifle." Who carries it: Pvt. Pyle (on the range), Cowboy, Eightball, and most of the grunts.
| Rifle Caliber | Best FMJ Round | Twist Rate Required | Use Case | | :--- | :--- | :--- | :--- | | .223 Rem / 5.56 | M193 (55 gr) | 1:12 or 1:9 | High velocity fragmentation | | 5.56 NATO | M855 (62 gr) | 1:7 or 1:8 | Barrier penetration, steel core | | .308 Win / 7.62 | M80 (147 gr) | 1:10 or 1:12 | General purpose, medium range | | .30-06 | M2 Ball (150 gr) | 1:10 | Historic military matches | | 7.62x39 | M43 (123 gr) | 1:9.5 | AK platform, steel-core penetration | full metal jacket rifle
There are several types of full metal jacket rifles available, including: A lightweight, select-fire assault rifle firing the small
Not every rifle stabilizes every FMJ bullet. Here is a cheat sheet. | Rifle Caliber | Best FMJ Round |
The full metal jacket (FMJ) rifle is a type of ammunition that has been widely used by military and civilian shooters for decades. Its popularity stems from its reliability, accuracy, and affordability. In this article, we will explore the history, design, and applications of the full metal jacket rifle, as well as its advantages and disadvantages.
The rifle that redefined the war. The M16’s 55-grain FMJ (M193) exhibited a bizarre terminal effect due to its high velocity. Upon impact, the light FMJ would frequently yaw (tumble) 90 degrees, fragmenting at the cannelure. This created a wound cavity that rivaled expanding ammunition. Later, the M855 "Green Tip" FMJ added a steel penetrator inside the lead core to improve barrier blind performance.